Fostex CR300 Service Manual page 54

CR300
BA5912AFP-Y (SERVO DIGITAL PCB ASSY: IC351, Driver IC)
• Block Diagram
25
1
• Pin Function
No. Pin Name
1 GND Sub-straight GND
2 MUTE1 CH1 mute pin
3 REF1 CH1 Vref switching pin
4 Pow Vcc1 Pow Vcc (CH1)
5 OUT1- CH1 negative output
6 OUT1+ CH1 positive output
7 GND Sub-straight GND
8 OUT2+ CH2 negative output
9 OUT2- CH2 positive output
10 Pow Vcc2 Pow Vcc (CH2)
11 Pre Vcc Pre Vcc
12 REF2 CH2 Vref switching pin
13 MUTE2 CH2 mute pin
54
24 23 22 21 20
10k
10k
LEVEL
SHIFT
Vref1 Vref1
REF1
SWITCH
10k 10k
10k
CH1
MUTE
2 3 4 5 6
Function
19 18
T.S.D.
LEVEL
SHIFT
Vref2 Vref2
10k
10k 10k
7 8 9
No. Pin Name
14 IN2' CH2 input pin for gain adjustment
15 IN2 CH2 gain fixed input
16 OP1 -OUT OP amp. 1 output
17 OP1 -IN - OP amp. 1 - input
18 OP1 -IN + OP amp. 1 + input
19 GND Sub-straight GND
20 BIAS Bias input
21 OP2 -IN+ OP amp. 2 + input
22 OP2 -IN- OP amp. 2 - input
23 OP2 -OUT OP amp. 2 output
24 IN1 CH1 gain fixed input
25 IN1' CH1 input pin for gain adjustment
17 16 15 14
10k
10k
REF2
SWITCH
10k
10k
CH2
MUTE
10 11 12 13
Function